Vtiger CRM is a fully open source CRM software solution with a worldwide community of developers and users. It includes modules to manage leads, sales opportunities, quotes, invoices, support tickets, knowledge base, inventory and more. Vtiger makes adaptable, cost effective, and easy to use cloud and on-premise CRM applications for small to medium sized businesses. While Vtiger is based on SugarCRM, it’s not a feature-for-feature clone. It has all of the core functions found in SugarCRM, but is missing some collaboration, task management, and third-party integration features out of the box. Like the Community edition of SugarCRM, Vtiger packs the features smaller organizations need and it’s extensible via add-ons. Pricing starts at $10 per user per month with a 15 day free trial. A free trial is available.